Both groups advanced to the next round, although DeGeneres described the accusers' stage outfits as "surreal."

Otherwise, the groups mostly worked together smoothly in "Hollywood Week," with a big majority of contestants winning the chance to sing and be judged again as the field is narrowed to 24 semifinalists.

In a hint of things to come, judge Kara DioGuardi told stunned teenager Katie Stevens of Boston that she was "the potential winner."